class B {
   int n;
   static int sum=0;
   void setN(int n) {
     this.n=n;
   }
   int getSum() {
     for(int i=1;i<=n;i++)
       sum=sum+i;
       return sum;
     }
}
public class Tfour {
   public static void main(String args[]) {
      B b1=new B(),b2=new B();
      b1.setN(3);
      b2.setN(5);
      int s1=b1.getSum();
      int s2=b2.getSum();
      System.out.println(s1+s2); 
   }
}
